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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd588fcd613c40a2f564d4060e463472ba38d8b284c54301400d69cb733b641d3' 
  AND token = 'cikpLb1Ihx33Rhkio2m2mN/apsVTRCu6k3dh9MyRa70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}